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eth/filters: enforce topic-limit early on filter criterias #29535

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merged 2 commits into from
Apr 15, 2024
Merged

eth/filters: enforce topic-limit early on filter criterias #29535

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eth/filters: enforce topic-limit early on filter criterias
holiman Apr 15, 2024
5a91d23
eth/filters: change limit to 1K
holiman Apr 15, 2024
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9 changes: 9 additions & 0 deletions eth/filters/api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,9 @@ var (
// The maximum number of topic criteria allowed, vm.LOG4 - vm.LOG0
const maxTopics = 4

// The maximum number of allowed topics within a topic criteria
const maxSubTopics = 1000

// filter is a helper struct that holds meta information over the filter type
// and associated subscription in the event system.
type filter struct {
Expand Down Expand Up @@ -539,6 +542,9 @@ func (args *FilterCriteria) UnmarshalJSON(data []byte) error {
return errors.New("invalid addresses in query")
}
}
if len(raw.Topics) > maxTopics {
return errExceedMaxTopics
}

// topics is an array consisting of strings and/or arrays of strings.
// JSON null values are converted to common.Hash{} and ignored by the filter manager.
Expand All @@ -559,6 +565,9 @@ func (args *FilterCriteria) UnmarshalJSON(data []byte) error {

case []interface{}:
// or case e.g. [null, "topic0", "topic1"]
if len(topic) > maxSubTopics {
return errExceedMaxTopics
}
for _, rawTopic := range topic {
if rawTopic == nil {
// null component, match all
Expand Down
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